package com.itheima.edu.info.manager.controller;

import com.itheima.edu.info.manager.domain.Student;
import com.itheima.edu.info.manager.service.StudentService;

import java.util.Scanner;

public class StudentController {
     private StudentService studentService = new StudentService();

     private Scanner sc=new Scanner(System.in);
    //开启学生管理系统，并展示管理系统菜单
    public void start() {
        //Scanner sc = new Scanner(System.in);
        studentLoop:
        while (true) {
            System.out.println("--------欢迎来到 <学生> 管理系统--------");
            System.out.println("请输入您的选择: 1.添加学生  2.删除学生  3.修改学生  4.查看学生  5.退出");
            String choice = sc.next();
            switch (choice) {
                case "1":
                    //System.out.println("添加");
                    addStudent();
                    break;
                case "2":
                   // System.out.println("删除");
                    deleteStudentById();
                    break;
                case "3":
                    //System.out.println("修改");
                    updateStudent();
                    break ;
                case "4":
                    //System.out.println("查询");
                    findAllStudent();
                    break ;
                case "5":
                    System.out.println("感谢你使用学生管理系统，再见");
                    break studentLoop ;
                default:
                    System.out.println("你的输入有误,请重新输入");
            }
        }

        }

    public void updateStudent() {
        String updateId = inputStudentId();
        Student newStu = inputStudentInfo(updateId);

        studentService.updateStudent(updateId,newStu);
        System.out.println("修改成功");
    }

    public void deleteStudentById() {

        String delId = inputStudentId();
        //3.调用业务员中的deleteStudentById根据id，删除学生
        studentService.deleteStudentById(delId);
        //4.提示删除成功
        System.out.println("删除成功");
    }

    public void findAllStudent() {
       //1.调用业务员中的获取方法，得到学生的对象信息
        Student[] stus= studentService.findAllStudent();
        //2.判断你数组的内存地址，是否为null
        if (stus == null) {
            System.out.println("查无信息，请添加后重试");
            return;
        }
        //3.遍历数组，获取学生信息并打印在控制台
        System.out.println("学号\t\t姓名\t年龄\t生日");
        for (int i = 0; i < stus.length; i++) {
            Student stu = stus[i];
            if (stu != null) {
                System.out.println(stu.getId()+"\t"+stu.getName()+"\t"+stu.getAge()+"\t\t"+stu.getBirthday());
            }
        }
    }

    public void addStudent() {
        //StudentService studentService = new StudentService();
        //1.键盘接收学生信息
        String id;
        while (true) {
            System.out.println("请输入学生id");
            id=sc.next();
            boolean flag = studentService.isExists(id);
            if (flag) {
                System.out.println("学号已被占用，请重新输入");
            } else {
                break;
            }
        }

        Student stu = inputStudentInfo(id);
        //3.将学生对象，传递给StudentService(业务员)中的addStudent方法
        boolean result=studentService.addStudent(stu);
        //4.根据返回的boolean类型结果，在控制台打印成功/失败
        if (result) {
            System.out.println("添加成功");
        } else {
            System.out.println("添加失败");
        }

    }

    public String inputStudentId() {
        String id;
        while (true) {
            System.out.println("请输入学生id：");
            id = sc.next();
            boolean exists = studentService.isExists(id);
            if (!exists) {
                System.out.println("你输入的id不存在，请重新输入");
            } else {
                break;
            }
        }
        return id;
    }

    //键盘录入学生信息
    public Student inputStudentInfo(String id) {
        System.out.println("请输入学生姓名：");
        String name = sc.next();
        System.out.println("请输入学生年龄：");
        String age = sc.next();
        System.out.println("请输入学生生日：");
        String birthday = sc.next();
        //2.将学生信息封装为学生对象
        Student stu = new Student();
        stu.setId(id);
        stu.setName(name);
        stu.setAge(age);
        stu.setBirthday(birthday);
        return stu;
    }
}

